According to the International Energy Agency, buildings are the largest energy-consuming sector globally, producing over one-third of greenhouse gas emissions in 2013. Renewable energies such as solar can be harnessed to fully or partially meet the energy demands of buildings. In this study, solar thermal collectors are used in a building to provide the hot water required for an underfloor heating system. Three cities in Iran, namely Tabriz, Tehran and Kish island, with distinctive climatic conditions are considered to gain a better understanding of the performance of solar-powered underfloor heating systems in different climates. Moreover, an economic analysis is conducted to assess the feasibility of the proposed system. DesignBuilder software is applied to simulate the energy performance of the building. The results indicate that the annual fuel consumption of the building with a solar collector located in Tehran, Tabriz and Kish island is reduced by 125.39, 303.58 and 1.41 MWh compared to that of without collector, respectively. The payback period of the system for Tehran, Tabriz and Kish Island is found to be 8.2, 9.4 and 12.1 years, respectively.

中文翻译：

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不同气候条件下太阳能地暖系统性能的比较研究

据国际能源署称，建筑是全球最大的能源消耗部门，2013 年温室气体排放量超过三分之一。可利用太阳能等可再生能源完全或部分满足建筑的能源需求。在这项研究中，太阳能集热器用于建筑物中以提供地板采暖系统所需的热水。伊朗的三个城市，即大不里士、德黑兰和基什岛，具有独特的气候条件，可以更好地了解太阳能地板采暖系统在不同气候下的性能。此外，还进行了经济分析以评估所提议系统的可行性。DesignBuilder 软件用于模拟建筑物的能源性能。结果表明，与没有集热器的相比，位于德黑兰、大不里士和基什岛的太阳能集热器建筑的年燃料消耗分别降低了 125.39、303.58 和 1.41 MWh。德黑兰、大不里士和基什岛的系统投资回收期分别为 8.2、9.4 和 12.1 年。